Can end with bonded seal slide

ABSTRACT

A can end is provided with a pour opening. The can end has a can end lapping portion adjacent the pour opening. A slide has a pivot on the can end and has a slide lapping portion and a slide sealing portion adjacent the slide lapping portion. The slide lapping portion is adapted to register with the can end lapping portion. A pull tab has a connection to the slide. Engaging means engage the can end lapping portion to press the can end lapping portion into intimate contact with the slide lapping portion. A pressure barrier material seals the can end lapping portion at a first predetermined shear strength and the slide sealing portion at a second predetermined shear strength less than the first predetermined shear strength. The slide is rotatable by the pull tab about the pivot to break the bond between the slide sealing portion and the pressure barrier material adjacent the can end lapping portion to uncover the pour opening.

United States Patent 11 1 Douty [5 4] CAN END WITH BONDED SEAL SLIDE[75] Inventor: Donald L. Douty, Franklin Township, Westmoreland County,

[73] Assignee: United States Steel Corporation,

Pittsburgh, Pa.

[22 Filed: Jan. 31, 1972 [21] Appl. No.: 222,070

Related s. Application Data [62] Division Of Ser. N0. 146,945, May 26,1971, which is a division of sei. N0. 61,384, Aug. 5, 1970, Pat. N0.3,622,055.

[56] References Cited UNITED STATES PATENTS Then ..222/557 X Baloeca etal. ..220/53 Primary Examiner-Stanley H. Tollberg Attorney-Robert J.Leek, Jr.

[57] ABSTRACT opening. A slide has a pivot on the can end and has aslide lapping portion and a slide sealing portion adjacent the slidelapping portion. The slide lapping portion is adapted to register withthe can end lapping portion. A pull tab has a connection to the slide.Engaging means engage the can end lapping portion to press the can endlapping portion into intimate contact with the slide lapping portion. Apressure barrier material seals the can end lapping portion at a firstpredetermined shear strength and the slide sealing portion at a secondpredetermined shear strength less than the first'p'redetermined shearstrength. The slide is rotatable by the pull tab about the pivot tobreak the bond between the slide sealing portion and the pressurebarrier material adjacent the can end lapping portion to uncover thepour opening.

22 Claims, 70 Drawing Figures PATENTEDAPR 3 I975 SHEET OBUF 34 mm APATENTEI] APR 3 I975 SHEET [180F134 PATENTEUAPR3 I973 SHEET USUF 34 FIG.80

FIG. 8E

APR 3 I975 ","JENTEU SHEET llUF 34 PATENTEDAPR 3 I975 SHEET lZUF 34PATENTEDAPR 3 1975 SHEET 130F 34 FIG. 12A

FIG. [28

FIG. IZC

PATENTEUAPR 3 I975 SHEET 150F3 1 nmm on 0; 9mm

PATENTEUAPR 3 I875 SHEET lBDF 34 FIG. 13E

FIG. I3F

PATENTEUMRB I975 13,724,728

' SHEET IBM 34

1. In combination: a. a can end provided with a pour opening,
 1. saidcan end having a can end lapping portion adjacent said pour opening, b.a slide having a pivot on said can end and having a slide lappingportion and a slide sealing portion adjacent said slide lappingportion,
 1. said slide lapping portion being adapted to register withsaid can end lapping portion, c. a pull tab having a connection to saidslide, d. engaging means engaging said can end lapping portion to presssaid can end lapping portion into intimate contact with said slidelapping portion to form a lapped joint, e. a pressure barrier materialdisposed about the entire periphery of said lapped joint and for sealingto said can end lapping portion at a first predetermined shear strengthand to said slide sealing portion at a second predetermined shearstrength less than said first predetermined shear strength, and f. saidslide being rotatable by said pull tab about said pivot to break thebond between said slide sealing portion and said pressure barriermaterial adjacent said can end lapping portion to uncover said pouropening.
 2. The combination recited in claim 1 wherein said slide has abulge strength measured in pounds per square inch equal to or less thanthe bulge strength of said can end.
 3. The combination recited in claim1 wherein said engaging means has a stationary member supporting onemember of said slide and said can end and a movable member engaginganother member of said slide and said can end.
 4. The combinationrecited in claim 1 wherein said pull tab is integral with said slide. 5.The combination recited in claim 1 wherein said pivot is integral withone of said can end and said slide.
 6. The combination recited in claim1 wherein said pivot is separate from one of said can end and saidslide.
 7. The combination recited in claim 1 wherein said engaging meansis magnetic.
 8. The combination recited in claim 1 and having stop meanson one of said slide and said can end for engaging the other of saidslide and said can end for limiting the movement of said slide.
 9. Thecombination recited in claim 1 wherein said pivot is sealed to said canend by said pressure barrier material.
 10. The combination recited inclaim 1 wherein said pour opening is radial.
 11. The combination recitedin claim 1 wherein said pour opening is chordal.
 12. The combinationrecited in claim 1 wherein said pour opening has substantially straightsides.
 13. The combination recited in claim 1 wherein said pour openinghas arcuate sides.
 14. The combination recited in claim 1 wherein saidpull tab is of the corrugated type.
 15. The combination recited in claim1 wherein said pulL tab is of the ring type.
 16. The combination recitedin claim 1 wherein said pull tab is of the serrated type.
 17. Thecombination recited in claim 1 wherein said pull tab is of theprojecting type.
 18. The combination recited in claim 1 wherein saidpull tab is of the waffle type.
 19. The combination recited in claim 1wherein said pull tab has a plurality of protuberances.
 20. Thecombination recited in claim 1 wherein said pull tab has a plurality ofcavities.
 21. The combination recited in claim 1 wherein said pull tabis of the embossed aperture type.
 22. The combination recited in claim 1wherein said slide is rotatable in either a clockwise orcounterclockwise direction.